could yelp
Verbo regular: yelp - yelped- yelped

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could yelp
you could yelp
he could yelp
we could yelp
you could yelp
they could yelp 	I could be yelping
you could be yelping
he could be yelping
we could be yelping
you could be yelping
they could be yelping	I could have yelped
you could have yelped
he could have yelped
we could have yelped
you could have yelped
they could have yelped	I could have been yelping
you could have been yelping
he could have been yelping
we could have been yelping
you could have been yelping
they could have been yelping	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't yelp
you couldn't yelp
he couldn't yelp
we couldn't yelp
you couldn't yelp
they couldn't yelp 	I couldn't be yelping
you couldn't be yelping
he couldn't be yelping
we couldn't be yelping
you couldn't be yelping
they couldn't be yelping	I couldn't have yelped
you couldn't have yelped
he couldn't have yelped
we couldn't have yelped
you couldn't have yelped
they couldn't have yelped	I couldn't have been yelping
you couldn't have been yelping
he couldn't have been yelping
we couldn't have been yelping
you couldn't have been yelping
they couldn't have been yelping	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I yelp?
could you yelp?
could he yelp?
could we yelp?
could you yelp?
could they yelp? 	could I be yelping?
could you be yelping?
could he be yelping?
could we be yelping?
could you be yelping?
could they be yelping? 	could I have yelped?
could you have yelped?
could he have yelped?
could we have yelped?
could you have yelped?
could they have yelped? 	could I have been yelping?
could you have been yelping?
could he have been yelping?
could we have been yelping?
could you have been yelping?
could they have been yelping? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I yelp?
couldn't you yelp?
couldn't he yelp?
couldn't we yelp?
couldn't you yelp?
couldn't they yelp? 	couldn't I be yelping?
couldn't you be yelping?
couldn't he be yelping?
couldn't we be yelping?
couldn't you be yelping?
couldn't they be yelping? 	couldn't I have yelped?
couldn't you have yelped?
couldn't he have yelped?
couldn't we have yelped?
couldn't you have yelped?
couldn't they have yelped? 	couldn't I have been yelping?
couldn't you have been yelping?
couldn't he have been yelping?
couldn't we have been yelping?
couldn't you have been yelping?
couldn't they have been yelping?